Update CircleCI config for new repo

[friedbunny]

Port the existing CircleCI configuration to work in this new repo.

To-do

• Port environment variables
• Actually build the thing on CI
• Fix tests (Tests #4, Update test target configuration. #18)

/cc @fabian-guerra

[friedbunny]

Disabled the CI job skipping script, since it’s not working yet: #19

[friedbunny]

Release builds are currently failing because they cannot build the core libraries:

▸ Linking Mapbox

❌  ld: library not found for -lmbgl-vendor-icu



❌  clang: error: linker command failed with exit code 1 (use -v to see invocation)


▸ Compiling UIDevice+MGLAdditions.m
** BUILD FAILED **


The following build commands failed:
	Ld /Users/distiller/project/build/ios/ios.build/RelWithDebInfo-iphonesimulator/dynamic.build/Objects-normal/x86_64/Binary/Mapbox normal x86_64
(1 failure)
make: *** [iframework] Error 65

This happens locally and on CI, so it blocks any sort of release.

[fabian-guerra]

Thank you!